<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
        html,
        body {
            margin: 0;
            padding: 0;
        }

        body {
            .hero {
                position: fixed;
                z-index: 1;
                top: 0;
                bottom: 0;
                left: 0;
                right: 0;
                background: url("http://lorempixel.com/g/1500/1000/nature/10/");
                background-size: cover;
                height: 170vh;
                width: 100vw;

                &:before {
                    content: "";
                    height: 100%;
                    width: 100%;
                    height: 170vh;
                    width: 100vw;
                    background: rgba(44, 123, 183, 0.5);
                    position: absolute;
                }

                h1 {
                    position: relative;
                    z-index: 1;
                    font-family: "Pacifico", cursive;
                    color: rgba(255, 255, 255, 1);
                    text-align: center;
                    font-size: 4rem;
                    line-height: 4rem;
                    text-shadow: 0 2px 2px rgba(0, 0, 0, 0.35);
                    max-width: 25rem;
                    margin: 30vh auto 0;
                    /*-webkit-transition: 1s opacity ease-in-out;*/
                }
            }

            .content {
                position: absolute;
                z-index: 1000;
                top: 80vh;
                background: rgb(44, 123, 153);
                height: 100vh;
                width: 100vw;
                box-shadow: 0 -2px 1px rgba(0, 0, 0, 0.15);
                border-top: 1px solid rgba(255, 255, 255, 0.2);
            }
        }
    </style>
</head>

<body>
    <section class="hero">
        <h1>Parallax Hero</h1>
    </section>
    <section class="content"></section>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script>
        $(window).scroll(function (e) { parallax(); });
        function parallax() {
            var scrolled = $(window).scrollTop();
            $(".hero").css("top", -(scrolled * 0.0315) + "rem");
            $(".hero > h1").css("top", -(scrolled * -0.005) + "rem");
            $(".hero > h1").css("opacity", 1 - scrolled * 0.00175);
        }
        /*$(window).scroll(function(){    if($(this).scrollTop() > 400){      $('.hero > h1').css('opacity',0);    } else {      $('.hero > h1').css('opacity',1);    }  });*/</script>
</body>

</html>